Rock-drill centralizer



April 1', 1924;

L. C. BA'YLES ROCK DRILL CENTRALIZER Filed April 13, 1923 INVENTOR H\s ATTo NEY g T A T PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION 015' NEW 5 a s I ROCK-DRILL CENTRALIZER.

Application filed a n'l 13, 1923. Serial no. 631,863.

To all whom it may concern:

' Be it known that I, LEWIS C. BAYLns, a citizen of the United States, a resident of Easton, county of Northampton, State of Pennsylvania, have invented a certain Rock Drill Centralizer, of which the following is a specification accompanied by drawings.

This invention relates to rock drills of the hammer type, but more especially to a centralizer for the drill steeL' The objects of this invention are to enable the drill steel to be maintained in the desired position on starting, when the drilled hole is to be made on an inclined surface in the face of the "wall.

Further objects of the invention will hereinafter appear, and to these ends; the invention is shown in one of its preferred forms in the accompanying drawings, in which- Figure 1 is a diagrammatic View in side elevation of a mounted rock'drill, having'the centralizer applied thereto, and

Figure 2 is a perspective view in an enlarged detail, of the centralizer applied to a rock drill.

Referring to the drawings, the rock drill A has the cylinder 13, back head C and front head D, into which the drill steel G extends for receiving the blows of impact of the hammer piston. The rock drill, A is slidably mounted in the. channel or guide wayE' of the shell .E, and is ada ted to oe moved longitudinally by the fee screw F, which may be rotated y the handle G secured thereto. In this instance, the shell E of the rock drill is clamped to the cross bar H in any suitable manner. The cross bar H may be adapted vertically on the column J as desired.

' on starting it is diflicult to keep the bit K of the drill steel 0 at the desired point against the rock. It is therefore necessary to employ some means for maintaining the drill steel bit in the desired position on starting. In accordance with my invention, 1 provlde a centralizer comprising a clam 0 preferably having pivotally connecte arms P and Q, the .outer ,portions of which are adapted to encircle or embrace the drill steel C, and guide the steel on starting a hole, as shown in Figure 2. The arms P and Q, which are in this instance pivoted together at R, are provided at their inner ends with the outwardly bent extensions S and .T respectively, which are adapted to slide means in channels or guide ways E of the shell E. The mner portlons of the arms P and Q are preferably adapted to be held in the guide ways E, and inthis instance the arms extend at an angle to the longitudinal axis of the .Shell E.. In order to force the. arms into frlctional engagement with the channels E, I provide a screw U threaded into the arm P and adapted to contact with the inner surface of the arm Q. By tightening the screw insane U against the inner surface of the arm Q,-

the arms will be forced outwardly into tight frictional contact. with the parts V and W of the shell E. I

The clam 0 may be removed any time after the ho e in the rock L has been pointed or started, by loosening the screw U and sliding the outwardly bent extensions S and T from the channels or guide ways E. This operation 1s, however, unnecessary as the front head D'of the drill will force the clamp O from the channels or guide we 5 E after the drill A has been forced a su cient distance forwardly by the feed screw F, and thelgafter the clamp may be removed as deslre 1 It will readily be seen that by means of my centralizer a hole in an inclined surface of the rock can be quickly and easily ointed or started without the drill bit sli g or skipping thereover. 1

claim:

1. In a rock drill, the combination with a shell having guide ways in which the rock drill carriage is adapted to move, of a 0811- tralizer for a drill steel comprising a pair of connected arms adapted to embrace the shank. of a drill steel, and manually operable means for frictionall holding portlons of said arms in said gui e ways tending to hold said centralizer stationary relativeto said shell.

bent extensions on the arms ada ted to slide in the guide waysof a rock'dr shell, and or removably securing the clamp to the shell of a rock drill. 3. A centralizer for drill steels, compris: ing lp'votally connected arms adapted to encirc e the drillsteel, outwardly ent extensions on the arms adapted to slide in the guide ways of a rockdrill shell, and means or forcing the outwardly bent extensions Q into tiht frictional engagement with the shello. a rock drill- I a. In a rock drill, the combination with a shell of a centralizer for maintainin the drill steel in alignment with the mac. ine, said centralizer comprising a clamp having pivotall connected arms adapted to encircle the dri 1 steel, extensions on the arms ada ted to slide in the said shell of the rock dril and means for frictionally binding the clamp in the shell.

5. In a rock drill, the combination with a shell of a centralizer for the drill steel, comprising/a clamp having pivotally connected arms adapted to encircle the shank of the drill steel and slide in the said shell of the rock drill, and a screw threaded into one of said arms and-ada ted to contact with the other arm, where y the shell may be gripped tightly by the clamp.

6. In a rock drill, the combination with a shell having uide ways, of a centralizer for the drill stee, comprising a clamp having pivotall connected arms adapted to encircle the s ank of a drill steel, outwardly bent extensions on said arms adapted to slide in said iuide ways and a screw threaded into one 0 said arms and adapted to bear a ainst the other arm for holding said clamp 1n the guide ways of the shell.

In testimony whereof I have signed this specification. Y

LEWIS C. BAYLES. 

